[PATCH][V4] rs6000: Remove unnecessary option manipulation.

[Martin Liška]

On 11/19/21 13:45, Segher Boessenkool wrote:
> On Fri, Nov 19, 2021 at 01:31:21PM +0100, Martin Liška wrote:
>> All right, so I can't send an email from my local machine and git imap-send
>> does not work as it goes through Thunderbird.
> 
> Hrm, painful (for you).  You should figure out how you can do the basics
> of the patch-based workflow that we all have to do.

Sure, but to be honest others don't have problem with patches attached to an email
(with whatever mime type an email client uses).

> 
>> So my last attempt is attaching the email so that you can add the .eml file.
> 
> I cannot do that, but it is text, so it is inlined fine.  Thanks.
> 
> This is almost identical to what git format-patch would give you, btw.

Sure, apparently Redirect plugin in TW should work and preserve the email as you need.

> 
>> Subject: [PATCH][V4] rs6000: Remove unnecessary option manipulation.
> 
>> Do not set flag_rename_registers, it's already enabled with EnabledBy(funroll-loops)
>> in the common.opt file. Use EnabledBy for unroll_only_small_loops which
>> is a canonical approach how can be make option dependencies.
>>
>> gcc/ChangeLog:
>>
>> 	* config/rs6000/rs6000.c (rs6000_override_options_after_change):
>> 	Do not set flag_rename_registers and unroll_only_small_loops.
> 
> Please don't end changelog lines in ":", it looks like something is
> missing.  Changelog lines wrap at 80 cols.
> 
>> 	* config/rs6000/rs6000.opt: Use EnabledBy for unroll_only_small_loops.
> 
>> --- a/gcc/config/rs6000/rs6000.c
>> +++ b/gcc/config/rs6000/rs6000.c
>> @@ -3466,13 +3466,8 @@ rs6000_override_options_after_change (void)
>>     /* Explicit -funroll-loops turns -munroll-only-small-loops off, and
>>        turns -frename-registers on.  */
>>     if ((OPTION_SET_P (flag_unroll_loops) && flag_unroll_loops)
>> -       || (OPTION_SET_P (flag_unroll_all_loops)
>> -	   && flag_unroll_all_loops))
>> +       || (OPTION_SET_P (flag_unroll_all_loops) && flag_unroll_all_loops))
> 
> You should mention this change in the changelog as well.
> 
>> -      if (!OPTION_SET_P (unroll_only_small_loops))
>> -	unroll_only_small_loops = 0;
>> -      if (!OPTION_SET_P (flag_rename_registers))
>> -	flag_rename_registers = 1;
>>         if (!OPTION_SET_P (flag_cunroll_grow_size))
>>   	flag_cunroll_grow_size = 1;
>>       }
>> diff --git a/gcc/config/rs6000/rs6000.opt b/gcc/config/rs6000/rs6000.opt
>> index 9d7878f144a..faeb7423ca7 100644
>> --- a/gcc/config/rs6000/rs6000.opt
>> +++ b/gcc/config/rs6000/rs6000.opt
>> @@ -546,7 +546,7 @@ Target Undocumented Var(rs6000_optimize_swaps) Init(1) Save
>>   Analyze and remove doubleword swaps from VSX computations.
>>   
>>   munroll-only-small-loops
>> -Target Undocumented Var(unroll_only_small_loops) Init(0) Save
>> +Target Undocumented Var(unroll_only_small_loops) Init(0) Save EnabledBy(funroll-loops)
>>   ; Use conservative small loop unrolling.
> 
> That is the opposite of the original logic.

You are correct! Forget about the patch, I don't want it merged any longer.

Martin

> 
> 
> Segher
>